using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
////----------------------------------------------------------------
////Module Name:  LinqExtensions
////Purpose:      
////CopyRight:    Muchinfo
////History:     
////----------------------------------------------------------------
////DateTime		2015/1/20 11:19:51
////Author        ouyang.hongbin
////Description   Create
////----------------------------------------------------------------


//----------------------------------------------------------------
//Module Name:  LinqExtensions
//Purpose:      
//CopyRight:    Muchinfo
//History:     
//----------------------------------------------------------------
//DateTime		2015/1/20 11:19:51
//Author        ouyang.hongbin
//Description   Create
//----------------------------------------------------------------

namespace Muchinfo.MTPClient.Data.Extensions
{
    public static class LinqExtensions
    {
        public static IEnumerable<TSource> Distinct<TSource, TProperty>(this IEnumerable<TSource> source, Func<TSource, TProperty> selector)
        {
            if (source == null)
            {
                throw new ArgumentNullException("source");
            }
            if (selector == null)
            {
                throw new ArgumentNullException("selector");
            }
            var pdis = source.Select(t => selector(t)).Distinct();
            foreach (var item in pdis)
            {
                yield return source.First(t => selector(t).Equals(item));
            }
        }
    }
}